strat·i·fy 
(strătə-fī′)
(strătə-fī′)v. strat·i·fied, strat·i·fy·ing, strat·i·fies
v.tr.
1. To form, arrange, or deposit in layers.
2. To prepare (seeds) for germination by storing them under cold, moist conditions.
3.
a. To arrange or separate into castes, classes, or social levels.
b. To separate into a sequence of graded status levels.
v.intr.
1. To become layered; form strata.
2. To develop different levels of caste, class, privilege, or status.